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ORIGINAL ARTICLE  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2019 May;59(5):784-90

DOI: 10.23736/S0022-4707.18.08339-1

Copyright © 2018 EDIZIONI MINERVA MEDICA

language: English

Measuring the validity and reliability of the Apple Watch as a physical activity monitor

Peng ZHANG 1 , Steven D. GODIN 2, Matthew V. OWENS 3

1 Department of Exercise Science, East Stroudsburg University, East Stroudsburg, PA, USA; 2 Department of Family and Preventive Medicine, University of Utah, Salt Lake City, UT, USA; 3 Cardia Rhythm Management Field Clinical Center, Syracuse, NY, USA



BACKGROUND: This study aimed to investigate the validity and reliability of the energy expenditure (EE) estimation of Apple Watch® among college students.
METHODS: Thirty college students completed two sets of three 10-minute treadmill walking and running trials while wearing three Apple watches and being connected to indirect calorimetry. The walking trials were at speeds of 54, 80, and 107 m·min-1 while the running trials were at 134, 161, 188 m·min-1. Energy expenditure comparisons were made using Two-way ANOVA with repeated measures. Reliability was analyzed by Intraclass Correlation.
RESULTS: There was no significant device x speed interactions (F (15, 696)=1.113, P=0.341) between the indirect calorimetry (criterion) and Apple Watch®. The lowest Inter-Class Correlation (ICC) scores were 0.49 (95%CI) at 54 while the highest were 0.72 (95%CI) at 107 and 134 m·min-1.
CONCLUSIONS: Apple Watch® demonstrated a low to moderate validity and reliability on measuring EE.


KEY WORDS: Physical activity - Calorimetry, indirect - Energy metabolism - Fitness - Equipment and supplies

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